Bug#661827: are you sure this is a "transitional package"?

[jidanni at jidanni.org]

Package: proj-data
Version: 4.7.0-1
Severity: minor

$ apt-cache search proj-data
proj-data - Cartographic projection filter and library (transitional package)
$ aptitude why proj-data
i   proj-bin Depends libproj0
i A libproj0 Depends proj-data

So I would replace "transitional package" with e.g., "data files".